【名词&注释】
基本特征(basic characteristics)、负载平衡(load balancing)、数据类型(data type)、通信模型(communication model)、网络带宽分配、数据链路层(data link layer)、工作单位(work unit)、直接关系(directly related)、后进先出(lifo)、不可分割的(indivisible)
[单选题]Routing．protocols use different techniques for assigning【S1】to individual networks．Further，each routing protocol forms a metric aggregation in a different．way．Most routing protocolscan use muh．iple paths if the paths have an equal【S2】．Some routing protocols can evenuse multiple paths when paths have an unequal cost．In either ease，load【S3】can improveoverall allocation of network bandwidth．When mulliple paths are used.there are several ways to distribute the packets．The two most common mechanisms are per—packet load balancing and per—destination load balancing．Per—packet load balancing distributes the【S4】across the possi-ble routes in a manner proportional to the route metrics．Per-destination load balancing distributes packets across the possible routes based on【S5】．【S1】
A. calls
B. metrics
C. 1inks
D. destinations
